Skip the auto shop - Our mechanics make house calls

Symptoms of a Bad or Failing Ignition Trigger

ignition trigger

Bad or Failing Ignition Trigger Inspection

by a top-rated mechanic at your home or office

The ignition trigger is an electronic mechanism of the vehicle’s engine management system, commonly found, in one form or another, on a large number of road going cars and trucks. Most ignition triggers operate as a magnetic sensor that is “triggered” as the unit rotates. When the mechanism is triggered, a signal is sent to the computer or ignition module, so that the ignition system can be properly timed and fired. Most ignition triggers come in the form of a magnetic hall effect sensor matched with a reluctor wheel. The components are usually located inside of the distributor, beneath the ignition rotor, or near the crankshaft pulley, sometimes with the reluctor wheel being part of the harmonic balancer. The ignition trigger serves the same purpose as the crank position sensor that is also commonly found on many road going vehicles. Both provide a vital signal that the entire engine management system relies on for proper operation. When the trigger fails or has an issue, it can cause major driveability problems, sometimes even to the point of rendering the vehicle inoperable. Usually a faulty ignition trigger will produce few symptoms that can notify the driver of the issue.

HAVE SYMPTOMS OF CAR TROUBLE?
Get an $80 diagnostic
by a top-rated mechanic at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

1. Car is hard to start

One of the first symptoms of an issue with the ignition trigger is problems starting the engine. If there is any issue with the ignition trigger or reluctor wheel it may compromise the signal to the computer. An incorrect trigger signal to the computer will throw off the entire engine management system, which may lead to issues when starting the engine. The engine may take more cranks to start than normal, or may require several turns of the key before firing up.

2. Check Engine Light comes on

Another symptom of a possible issue with the ignition trigger is an illuminated check engine light. Some systems will come equipped with redundant sensors that will allow the engine to run even if there is an issue with the ignition trigger. Apart from causing performance problems, any issues with the ignition trigger can be detected by the engine computer, which will set off the check engine light to notify the driver of an issue. Any vehicle with an illuminated check engine light should be (scanned for trouble codes)[https://www.yourmechanic.com/services/check-engine-light-is-on-inspection], as the check engine light can be activated by a wide number of issues.

HAVE SYMPTOMS OF CAR TROUBLE?
Get your car fixed at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

3. Car is not starting

A no start condition is another symptom of a possible problem with the ignition trigger. Some engine management systems use the ignition trigger as the primary signal for the entire engine management system. If the trigger fails, or there is an issue, this signal may be compromised or disabled, which may produce a no start condition due to there being no base signal for the computer. A no start condition can also be caused by issues with the ignition and fuel systems, so a proper diagnosis is recommended to be sure of the issue.

Ignition triggers are found on most vehicles in one form or another, and are an important component to the proper operation and driveability of the vehicle. If you suspect that your vehicle may be having an issue with the ignition trigger have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the trigger should be replaced.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...
P0608 OBD-II Trouble Code: Control Module VSS Output "A" Malfunction
P0608 means there is an malfunction in the vehicle speed sensor A control module often due too faulty speed sensor or shorted electrical wiring.


Related questions

Q: Starting issue, fuel smell

The fuel pressure would need to be checked to make sure the pressure regulator is not leaking fuel and that the pressure is correct. You may have a leaking injector if the pressure is okay. I recommend having a certified...

Q: My truck turns over but stops turning over by itself and won't start back up.

Hi there. Sounds like you have a starter motor that is failing. When the starter relay gets hot, it will overload the ignition circuit and shut off when cranking. Check the battery cables to the solenoid on the starter and...

Q: Truck not starting after sitting

Hi there. It sounds like you may have a battery reaching the end of its life cycle. Over time, batteries will lose their ability to hold and keep a charge. Typically between 7 and 10 years depending on the environment...